Home > VMware, VMware ESXi > Upgrading from ESXi 5.5 to ESXi 6.x via SSH and esxcli In the wake of VMware’s release of ESXi 6.0, I upgraded my ESXi 5.5 server to ESXi 6 using the install ISO file. However, it is also possible to perform the upgrade from 5.5 to 6.0 via SSH and esxcli. For more details, see below the jump. To upgrade from ESXi 5.5 to 6.0 using esxcli: 1. Shut down all VMs running on